Trigger mechanism for shoulder-arms.



T. C. JOHNSON.

TRIGGER MECHANISM FOR SHOULDER ARMS.

APPLICATION FILED JUNE 28, 1916. 1,21 3,204. Patented Jan. 23, 1917.

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T. C. JOHNSON.

TRIGGER MECHANISM FOR SHOULDER ARMS.

1 APPLICATION FILED JUNE 28. I916.

Patented Jan. 23, 1917.

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UNITED STATTdg FATENT @ldldl GE.

THOIMAS C. JOHNSON, OF NEW HAVEN, CGNIIEGTICUT, ASSIGNOR TO WINCHESTER BEPEATING ARMS 00., OF NEVT HAVEN, CONE-IEC'IIGUT, A COEPORATIUN.

TRIGGER MECHANISM'. FOR SHOULDER-ARMS.

Application filed June 28, 1916.

To all whom it may concern Be it known that 1, Tnonns G. Jonnson, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented-a new and useful Improvement in Trigger lvlechanism for Shoulder-Arms; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in

Figure 1 a broken view in side elevation of a shoulder-arm provided with my improved trigger-mechanism. Fig. 2 a broken view thereof with portions of the butt-stock broken away to show the trigger-mechanism in side elevation. Fig. 3 a similar view with the triggerguard and trigger-mechanism shown in central vertical longitudinal section. Fig. 1 a detached broken plan view of the trigger-guard with the box-magazine in horizontal section. Fig. 5 a similar plan view showing the guard as stripped. Fig. 6 a view in vertical transverse section on the line 66 of Fig. i. Fig. 7 a detached view in side elevation of the separately organized trigger-mechanism. with the parts thereof in their normal positions with. the set-trigger out of engagement with the trigger proper. Fig. 8 a plan view thereof. Fig. 9 a view corresponding to Fig. 7 but with the set trigger in its set position. Fig. 10 a detached view in right hand side elevation of the trigger proper. Fig. 11 a view in left hand elevation of the set-trigger. Fig. 12 a detached perspective view of the mount ing-blocl: of the trigger-mechanism.

My invention relates to an improved trigger-mechanism for bolt-action shoulderarms, th object being to provide an independently organized trigger-111cc ninisrn ior use in converting bolt-action military miles into bolt-action sporting rifles of the settrigger type.

With these ends in view, my invention consists in an independently Organized trigger-mechanism comprising a mounting-block. carrying a trigger and settr1gger.

My invention further consists in an in dependently organized trigger-mechanism comprising a mounting-block, carrying a Specification of Letters Extent.

- Patented Jan. 23, 1917.

Serial no. 106,335.

trigger, a settrigger, and means for adjusting the said mechanism.

My invention further consists in certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

in carrying out my invention as herein shown, I employ a mounting-block 7 formed with a vertical longitudinal slot 8 extending substantially throughout its length for the reception of a trigger 9 hung toward the forward end of the slot 8 upon a pin 10, and a set-trigger 11 located toward the rear end of the slot and hung upon a pin 12. The block is also formed, as herein shown, with an integral depending tie-lug 13 receiving an adjusting screw 14L by means of which the mechanism is set to increase or decrease the sensitiveness of the action of the trigger 9 when the set-trigger 11 is used. The said trigger 9 is formed at its upper end with a rearwardly projecting operating-arm 15 the straight upper edge of which co-acts with a roller 16 mounted in the lower end of a depending sear-knockoff arm 17 which, being of well known construction and operation in bolt-action shoulder arms, calls for no detailed description. At its forward end, the trigger 9 is formed with a shoulder 18 the lower face of which is engaged by a lifting-arm l9 turned inwardly at a right angle from the forward end of a trigger-spring 20 the rear end of which is fastened by a screw 21 to the upper face of the rear end of the trigger-guard 22 at the left hand side thereof, the said mounting block 7 being formed near its forward end with a transverse opening 23 for the reception and play of the said lifting-a'an 19. At its forward end the said trigger 9 is formed with a lug 24 the under ac of which is engaged by a beveled nose 25 formed at the forward end of the forwardly projecting arm 26 of the set-trigger 11, the said arms 15 and 26 being offset so as to lie side by side in the slot 8 of the block 7 as shown in Figs. 4t, 6 and 8. The straight upper edge of the arm 26 0f the set-trigger 11 also co-acts with the roller 16 of the sear-knock-ofl arm 17 before referred to. At its rear end the set-trigger 11 is notched as at 27 for the formation of a projection 28 which is engaged with an arm 29 turned inwardly at a right angle from the rear end of a heavy set-trigger spring 30 the forward end of which is fastened by a screw 31 t the forward portion.

of the upper face of the guard 22 at the right hand side thereof as clearly shown in Fig. 4.

The adjusting screw 14 aforesaid extends upward through the tie-lug 13 of the mounting block 7, into the slot 8 and engages with the lower edge of the. operating arm 15 of the trigger 9, as best shown in Fig. 6, the inner face of the arm 26 of the set-trigger 11 being formed with a clearance cut 32 for the clearance of the said screw as clearly shown in Fig. 6.

For the reception of the pins 'and'12 aforesaid, the mounting-block 7 is formed with transverse holes 33 and 3%, while for securing the mounting block 7 in the trigger-guard 22 it is provided with transverse holes 35 and 36 for the reception of fastening-pins 37 and 38.

The trigger-mechanism, thus described, in so far as it comprises the mounting-block 7, trigger- 9, set-trigger 11 and adjusting-screw 1, is organized entirely independently of the rifle and is assembled and handled as a unit.

lVIilitary rifles of the bolt-action box-magazine type are provided with. a single trigger extending down into the finger-portion of the trigger-guard in about the position occupied by the trigger 9 in the accompanying drawings. For the conversion of such a rifle into a sporting-rifle, the cut or slot formed in the guard for the downward pas sage of the ordinary trigger, is rearwardly extended to form a slot 39 long enough for the passage downward through it of the set trigger 11 in addition to the trigger 9 as well as the downwardly extending lug 13 of the mounting-block 7 The mounting-block 7 itself is adapted to be set into the lightening cut 40 initially formed in the rifle for decreasing its weight. After the block 7 has been secured in place by the pins 37 and 38, the trigger-spring 20 and the set-trigger spring 30 are secured to the guard for coaction with the respective triggers 9 and 11.

What I particularly wish to emphasize in this connection is, that the conversion of the rifle from a military to a sporting rifle, calls for nothing more than the removal of its own trigger and the introduction into it of my improved set-trigger mechanism which requires no structural modification of the original rifle except the slight cutting described necessary for the introduction of the trigger-mechanism. The rifle must also be supplied with a suitable sear-knock-off memher such as 17 for co-action with the arms and 26 of the triggers 9 and 11. The springs and 21 have to be added, but

this does not call for any change in the rifle beyond the making of the screw-holes for the screws 21 and 31.

In the use of the rifle as converted, the trigger 9 is pulled against the tension of its spring 20 for the lifting of its arm 15 against the sear-knockoff member 17 which fires the gun in the ordinary manner. For the use of the rifle in fine shooting, such as targetwork, in which the pull of the trigger must be reduced to what is spoken of as hairpressure, the set-trigger 1 is pulled back against the tension of its heavy spring 30 until its nose snaps under the lug 52 1 of the trigger'9. The engagement of the nose with the lug 2%: as illustrated in Fig. 9 is so slight as to overlap, that they will be disengaged by a very slight movement of the trigger 9. Therefore when the trigger 9 ispulled rearward very slightly, the settrigger 11 will be released to the full power of the heavy spring which will cause the arm 26 of the set-trigger to fly up and strike the roller 16 of the sear-knock-olf member 17 a sufficiently sharp blow to move it and fire the gun. The adjusting-screw let before described is employed to regulate the sensitiveness of this trigger-mechanism by predetermining the extent to which the lug 2st will overlap the nose 25 when the set-trig ger 11 is being used. The mounting-block 7 with its long slot 8, is tied together, as it were, by the tie-lug 1-1 joining the forward ends of its side walls just as the lug 13 joins the same together at a point to the rear of its longitudinal center. The trigger 9 and set-trigger 11, extend downward through the cut 39 into the finger portion 12 of the trigger-guard 22.

I claim 1. In an independently organized settrigger mechanism, the combination with a mounting-block formed with a slot extending throughout its length and having its side walls united by tie-lugs one of which extends below them, a trigger pivotally mounted in the forward end of the said slot, a set-trigger pivotally mounted in the rear end of the said slot, and an adjusting-screw mounted in the said depending tie-lug.

2. In a shoulder-arm, the combination with a guard provided with a slot, of an independently organized set-trigger mechanism comprising a mounting-block carrying a trigger and a set-trigger and adapted to be located in the said guard in position for the said triggers to extend downward through the said slot into the ringer-portion of the guard, and springs applied to 'the guard for co-action with the said triggers.

THOMAS C. JOHNSON.

Copies of this patent ma; be obtained for five cents each, by addressing the"Gommissioner of Patents,

Washington, D. C. V 

